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harryb2448

 
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Member Since: Nov 28, 2007
Location: Nambucca Heads Australia
Posts: 18,319
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Mac Specs: iMac i5 2.7GHz, 16GB memory, OS 10.10.1

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Did you use any thermal paste when you installed the heat sink? Sometimes a touch of Artic Silver is required.

If problem still persists, have you got the original CPU to pop back in and see if all is well with that? If it is okay dodgy upgrade.
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